/*
 * Copyright (C) 2007-2010 Geometer Plus <contact@geometerplus.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

package org.geometerplus.zlibrary.core.filesystem;

import org.amse.ys.zip.LocalFileHeader;
import org.amse.ys.zip.ZipFile;

import java.io.IOException;
import java.io.InputStream;
import java.util.*;

public final class ZLZipEntryFile extends ZLArchiveEntryFile {
    public static List<ZLFile> archiveEntries(ZLFile archive) {
        try {
            final ZipFile zf = ZLZipEntryFile.getZipFile(archive);
            final Collection<LocalFileHeader> headers = zf.headers();
            if (!headers.isEmpty()) {
                ArrayList<ZLFile> entries = new ArrayList<ZLFile>(headers.size());
                for (LocalFileHeader h : headers) {
                    entries.add(new ZLZipEntryFile(archive, h.FileName));
                }
                return entries;
            }
        } catch (IOException e) {
        }
        return Collections.emptyList();
    }

    private static HashMap<ZLFile, ZipFile> ourZipFileMap = new HashMap<ZLFile, ZipFile>();

    private static ZipFile getZipFile(final ZLFile file) throws IOException {
        synchronized (ourZipFileMap) {
            ZipFile zf = file.isCached() ? ourZipFileMap.get(file) : null;
            if (zf == null) {
                zf = new ZipFile(new ZipFile.InputStreamHolder() {
                    public InputStream getInputStream() throws IOException {
                        return file.getInputStream();
                    }
                });
                if (file.isCached()) {
                    ourZipFileMap.put(file, zf);
                }
            }
            return zf;
        }
    }

    static void removeFromCache(ZLFile file) {
        ourZipFileMap.remove(file);
    }

    ZLZipEntryFile(ZLFile parent, String name) {
        super(parent, name);
    }

    @Override
    public long size() {
        try {
            return getZipFile(myParent).getEntrySize(myName);
        } catch (IOException e) {
            return 0;
        }
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return getZipFile(myParent).getInputStream(myName);
    }
}
